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The air circulation on Earth is such that with each breath you are likely breathing in at least one atom that was previously breathed in by every other person that has ever lived. That breath you just took, contained an atom that Julius Cesar once breathed in, and another from Abe Lincoln, and yet another from Marilyn Monroe.

The same holds true for a cow. Each molecule of oxygen breathed in contributes to the cows continued existence, and more specifically to helping it carry out it's biological functions including making milk.

From that point of view Ron Jeremy, Donald Trump, and Adolf Hitler each played a tiny role in helping you wet down your cereal this morning.